Oscillation system



March 19, 1935. w. w. EITEL 1,994,760

OSCILLATICN SYSTEM Filed NOV. '7, 1935 INVENTORY WILL/AM m E/TEL.

A TTORNE Y Patented Mar. 19, 1935 1,994,760

UN -ITE D s TAT es. PAT E NT oF-F-i '7 v l 2 9 39 V f I V.

OSCILIQA'IION SYSTEM William W. Eiiiel, San Bruno, Calif asfsignor to' Heintz & Kaufman, Ltd.,-SanFrancisc0, Calif., a corporation of Nevada a A plication November 7, 1933, Serial No, 696,976

'2 Claims. (o1. 250 36) My invention relates to an oscillation system My invention may be best understood by refadapted to produce ultra-high frequency currents erence to the drawing. a and more particularly to a system utilizing a pair A pair of tubes 1 and 2, preferably of a type of electrical discharge tubes in which grids are described in the above-mentioned application are 5 used as electrostatic shields between anode and positioned on a shield 4 electrostatically dividing 5 cathode. a container or other space into two portions. The Among the objects of my invention are: tubes referred to have their grids extended to, To provide an oscillation system capable of or through the walls of the envelope to cooperate producing large amounts of ultra-high frequency With the Shield and having grid Wires SO Spaced power; t provide simple d t a t bl that the effective capacity between cathode and 10 oscillation system; and to provide an oscillation anode is substantially nil. The two tubes are resystem for utilizing with full efliciency as oscilversed in relation, so that the anode of one is lators, tubes wherein .anode to cathode capacity the Sa e Side of the shield as the cathode'of the is substantially nil. other.

Other objects of'my invention will be apparent I h n n t a tu d circuit 5 to the a o 15 or will be specifically pointed out in the de- 6 of tube 1, and a similar circuit 7 to the cathode scription forming a part of this specification, but 9 f b 2- Both of these circuits are on the I do t limit m self to th mbodi t of my same side of the shield and are preferably loosely invention herein described, as various forms may Coupled a indicated by e a row 10.

be adopted within the scope of the claims. on the other side of the shield another tu ed 20 The figure ho preferred ir uit, diagramcircuit 11 is connected to the cathode 12 of the matic and reduced to lowest terms, employing two tube and a fourth tuned circuit 14 is congrounded-grid tubes of the general type disclosed nected to the anode 15 of tube 2. All of the in the co-pending application of Ralph M. Heintz, tuned circuits are similar. The two latter cir- Serial Number 688,328, filed September 6, 1933 for Quits are also 3 oollpled- 25 a, shiemed electrode-tube, Each of the tuned anode circuits is grounded The invention is, however, adaptable to all tubes radio frequency through y-pass Co densers having a grid or control element therein which 16 a and h anodes energized through anmay act as an effective electrostatic shield beode leads 19 and 20. tween anode and, cathode, Each of the tuned cathode circuits is provided 30 As the anode-cathode capacity in a va um with leak resistors 21 and 22 shunting grid contube as ordinarily used in the well-k wn t d, densers 24 and 25. I prefer to provide the shield grid, tuned-plate circuit is depended on for feed with a gr und connection 26. back, it must therefore necessarily enter into the Each tube as hooked up, taken by itself, is a determination of the frequency at which the tube complete oscillating system such as described in 35 will oscillate. At extremely low frequencies, tubes the applica n above referred h ys b in which the capacity is considerable, are overing a tuned cathode-tuned anode circuit having excited, necessitating a reversed feed back, or a grounded grid- It Will y oscillate, however, neutralization of the capacity effect. It is well when the anode-cathode capacity is sufiicient to known that outputs under such conditions are Provide the Proper feed backs s desi ed 40 low, and one of the main objects of the Heintz in the instant case, the grid control is made high invention above referred to was to obtain large by the use of fine, closely spaced grid control power outputs in tubes having electrodes of nor- Wires, the tube will not oscillate as the feed back mal size and in the usual spacing relationships. is insufficient, due to the substantially complete I have found, however, that when the developshield provided by the grid. 1 v 45 ment of the Heintz tube is carried to its logical When however, two tubes, both circuits of conclusion, that the effective anode-cathode eawhich are of the tuned anode-tuned cathode type, pacity became substantially ,nil, and there was as above described, are so coupled that the anode not sufficient feed back to excite the tube even circuit of one positively drives the cathode cirat extreme ultra-high frequencies. cuit of the other, the system will then oscillate 50 I have solved the problem of making such tubes freely over an extremely wide range of frequeneflicient oscillators by positively and mutually excies, the oscillators being entirely independent of citing two tubes having the above described charthe anode-cathode couplings. The circuit I have acteristics, thereby causing them to become stable just described fulfills all the requirements for and efiicient generators of high frequency power. oscillation at ultra-high frequencies. 55

In addition, the system is exceptionally stable. The four tuned circuits, all having similar constants, stabilize the output to a remarkable degree. It is well known that the tuned grid-tuned plate circuit is stable, but the circuit shown is even more so due to the additional tuned circuits involved.

I have found, that by utilizing the positive drive herein shown, that there is no need of making tubes dimensionally small in order to get them to generate ultra-high frequencies. I reduction in size, of course, greatly reduces their output. I am able to employ large tubes having the ability to produce considerable amounts of power, and obtain that power 'by substantially completely shielding the anode from the cathode and using one tube to drive another.

Iclaim: 1. A short wave oscillator system comprising a pair of thermionic tubes having coplanar grounded grids, a shield connecting said grids in the same plane therewith and arranged to sub- Such stantially electrostatically isolate the anodes from the cathodes of said tubes, said tubes being so positioned as to have the anode of one and the cathode of the other on the same side of said positioned as to have the anode of one and the cathode of the other on the same side of said shield, a tuned circuit connected to each of said anodes and cathodes positioned on the same side of the shield as the electrodes to which they are connected, the tuned circuits on each side of the shield being coupled to produce oscillations in said tubes. I

I WILLIAM W. EI'I'EL. 

